Automatic heat-regulating device.



E. B JONES.

AUTOMATlC HEAT HEGULATING DEVICE.

APPLICATION man 05c. 23, m5.

1 ,2@0,363. Patented Oct. 3, 1916.

IIVVEIVTOR EVE/HE 7'5 5. JAM/E51 BY W A ITORNEYS mews Penn. w PHOTO-MING wAsnmcmm u L EVERETT.BLAINE JONES, 0F LIMA, OHIO.

AUTOMATIC HEAT-REGULATING DEVICE.

Specification of Letters Patent.

Patented Oct. 3, 1916.

Application filed December 23, 1915. Serial No. 68,356.

To all whom it may concern:

Be it known that I, EVERETT B. JoNns, a citizen of the United States, and a resident of Lima, in the county of Allen and State of Ohio, have'invented a certain new and useful Improvement in Automatic Heat-Regulating Devices, of which the following is a specification.

My invention relates to improvements in damper regulating devices for furnaces, and consists in the constructions, arrangements, and combinations of parts herein described and claimed.

The principal object of my invention is to provide means whereby it is made possible to convert a part of the thermal energy of the fire into mechanical energy through the utilization of the expansive power of confined air when heated.

Another object of my invention is-to provide a simple arrangement of parts by means of which the derived mechanical energy is caused to automatically open and close the draft damper of the furnace.

Other objects and advantages will appear in the following specification reference being had to the accompanying drawing forming a part thereof, in which Figure 1 is a side elevation of my arrangement showing its application to a hotair furnace, a part of the furnace and the float chamber being shown in section. Fig.

. 2 is a detail side elevation of the draft door operating lever mechanism, showing the po' sition assumed when the door is closed. Fig. 3 is a detail section on the line 33 of Fig. 2.

In the drawing, 1 represents the furnace which is provided with a draft opening 2 near the bottom, and a door 3 which is hinged horizontally above the opening so that it may swing downwardly and cover it.

An air-tight tank 4 is located within the heat drum 5 of the furnace 1 so that it will be in contact with the heated air from the furnace which is to be controlled as will presently be made clear. The interior of the tank 4: communicates through a tube 6 with the interior of a bell 7 which normally rests on the bottom of a vessel 8 in which the bell is located. The vessel 8 is filled with a liquid to a level just below the top of the bell 7, so as to leave a narrow air space into which the tube 6 leads as shown in Fig. 1.

The air within the tank 4 on being expanded by the heat in the drum 5, passes through the tube 6 and raises the hell 7 from its resting place on the bottom of the vessel 8. The movements of the-bell 7 affect the A graduated arm 15- is pivotally hung from the arm 9 and is provided with an adjustable stop 16 which is held to its adjusted position by a thumb screw 17 another stop 18 being provided on the lower end of the arm to prevent the stop 16 from falling off at any time.

A weight 19 equal to the weight of the hell 7 is disposed on the arm 15 and is freely slidable thereon, the weight 19 to this end having a passage 20 therethrough to admit the arm 15. The weight'is supported by a cable 21 which passes over pulleys 22 and connects at its lower end to a rod 23 which, as shown in Fig. 1, is secure'dto the'top of the bell 7 and projects out of the top of the vessel 8. The purpose of the graduations on the face of the arm 15 is to facilitate the adjustment of the stop 16 as well as to note the various positions to which the weight 19 moves.

Having thus described my invention, the method of its operation is as follows: When a ore is started in the furnace 1, the lever 9 is substantially in the position shown in Fig. 1 and in full lines in Fig. 2, at which time the draft door or damper 3 is held open. The air within the tank 4 is now at normal volume and the bell 7 which is open at the bottom, is now resting on the bottom of the vessel 8. As the heat in the drum 5 of the furnace becomes greater, the air in the tank 4 will become heated correspondingly and will begin to expand, finding an outlet; through the tube 6, and into the space between the liquid in the vessel 8 and the bell 7. The pressure beneath the bell 7, due to the expansion of the air, causes the bell to rise and the weight 19 to lower until it engages the stop 16. The weight of the member 19 overcomes the balance of the weight 13 and the arm 9 and causes the arm 15 to pull the front end of the arm 9 down wardly and permit the door 3 to close the draft opening 2.

The action of the thermo-mechanical draft checking device is entirely automatic. As soon as the heat in the furnace becomes of lesser temperature, due to the checking of the draft, the air in the tank a cools somewhat and in contracting permits some of the air in the bell 7 to withdraw and consequently allows the bell to lower. The lowering of the bell 7 raises the weight 19 from the stop 16, permits the weight 13 to overbalance the weight of the door 3, and causes it to again open gradually and in the same ratio as the air in the tank 4: contracts.

VVllile I have shown the device applied to a coal furnace, it is obvious that it may be used in other relationships and embodiments without departing from the spirit of the invention or the scope of the claims.

I claim 1. The combination with a furnace having a draft opening and a damper therefor, of a counterbalanced lever for holding the damper open, a stop associated with the lever, a weight adapted to engage the stop, an overbalancing bell flexibly supporting the weight, the bell having an air space and a water seal, an air tank in the furnace, and a pipe connection between the air tank and the aforesaid air space.

2. The-combination with a furnace having a draft opening and a hinged damper adapted to close the opening, of an air containing tank located within the furnace, the tank having an opening, a vessel located adjacent to the furnace, said vessel containing a liquid, a bell arranged in the vessel and forming an air space between the surface of the liquid and the top of the bell, a tube joined with the aforesaid air tank opening and having communication with the air space in the aforesaid bell, counterweighted lever devices for holding the damper from the draft opening, the lever devices includ ing a stop, and a counterweight cooperative with the bell, the counterweight being adapted to engage the stop to operate the lever devices and close the draft opening when the air in the aforesaid tank expands.

8. The combination with a furnace having a draft opening and a hinged damper adapted to close the opening, of a counterweighted lever arranged to hold the damper from the draft opening, a stop disposed on the lever, a bell located adjacent to the furnace having an air space and a liquid seal therefor, an air tank located in the furnace, the tank hav ing an opening, the air in the tank being adapted to be heated, a tube between the aforesaid air space and the opening in the air tank, and a movable weight connected to and supported by the bell, the weight being adapted to engage the aforesaid stop and move the damper when the air in the air tank expands.

a. The combination with a furnace having a draft opening and a hinged damper adapted to close the opening, of a pivoted and counterweighted lever adapted to hold the damper from engagement with the opening, an arm depending from the lever, an ad justable stop arranged on the arm, a movable weight adapted to engage the stop, an air tank located within the furnace, the air being adapted to be expanded by heating, a movable bell having a water seal an air chamber being formed between the bell and the water surface the air chamber being in communication with the air tank, and a connection between the bell and the movable weight, the weight having a limited movement before engaging the coacting stop but engaging the stop upon further expansion of the air in the tank.

5. The combination with a furnace having a draft opening and a hinged damper adapted to close the opening, of a vessel containing a liquid, the vessel having an opening in its bottom, a bell arranged to normally rest on the bottom of the vessel and having an air space between the surface of the liquid and the top of the bell, the bell being adapted to be lifted from the bottom of the vessel, a tank located within the furnace, the tank having an opening and containing air adapted to be heated, a tube connected between the air tank opening and the air space in the bell, the tube having passage through the opening in the vessel, a cable secured to the top of the bell, a weight supported on the end of the cable and adapted to move as the bell is lifted, pulleys for supporting the cable, and lever devices connected with the damper and cooperative with the aforesaid weight whereby the damper is closed when the weight is moved by the lifting of the hell.

6. The combination with a furnace having a draft opening and a hinged damper adapted to close the opening, of a horizontally disposed lever fulcrumed on a fixed support, a cable connection between one end of the lever and the damper, an overbalancing weight on the opposite end of the lever, an arm pivoted on the aforesaid lever between the cable and fulcrum connections, the arm having graduations and a stop at the bottom, an adjustable stop arranged on the arm, a movable weight having an opening through which the arm has passage, the weight benections between the bell and the movable ing adapted to engage the stop, a bell having weight to transmit the movements of the bell an air space and a water seal therefor, an air to the weight and close the draft opening.

tank located within the furnace in contact EVERETT BLAINE JONES. with the heat, a tube connection between the Witnesses:

tank and the air space in the bell in which ELWELL MGCLAIN,

the air expands upon heating, and cable con- BESSIE Arms.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. O." 

